Question

The absolute refractive indices of two media 'A' and 'B' are 2.0 and

1.5 respectively. If the speed of light in medium 'B' is 2x108

m/s,calculate the speed of light in:

(i) vacuum

(ii) medium 'A'.
​

Answer 1

Answer:

speed of light =speed in vacuum/refractive index

2x10^8=speed in vacuum of light/1.5

speed in vacuum of light=3x10^8m/s

now

speed in medium A=speed in vacuum/refractive index

=3x10^8/2=1.5x10^8m/s